This is not definitive, but is from a page from a parts book I have. (the page, not the book). This is for around 1971
Firstly, there is a difference between a Clubman and a Leyland Mini 1100. The Mini 1100 is the base model, the Clubman is the slightly specked-up model, or more accuratley, the Clubman is the normal model, the Mini 1100 the base cheap fleet version.
YDO21 is the Mini 1100. YDO21V is the Mini 1100 van.
YDO22 is the Clubman.
YDO 23 is the Clubman GT.
Body number (not to be confused with chassis number) should have M2 over 21 for Mini 1100, MV over 21 for 1100 van, M2 over 22 for Clubman and M2 over 23 for Clubman GT.
Therefore it stands to reason (oh dear, logic and Leyland in the same context) that the first part of the number defines what model it is: ie. 022 would be Clubman, 021 would be 1100 van.
OK, so far so good, we've worked out the first digit. bloody brilliant.
The rest is basicvally a mystery, so I'd be interested too.
Cheers,
Watto.
